Effect of timing of energy and carbohydrate replacement on post-exercise insulin action
The nutritional environment surrounding an exercise bout modulates post-exercise insulin action. The purpose of this study was to determine how timing energy and carbohydrate replacement proximate to an exercise bout influences exercise-enhanced insulin action. To create an appropriate baseline, sen...
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Published in | Applied physiology, nutrition, and metabolism Vol. 32; no. 6; pp. 1139 - 1147 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
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Canada
NRC Research Press
01.12.2007
Canadian Science Publishing NRC Research Press |
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Abstract | The nutritional environment surrounding an exercise bout modulates post-exercise insulin action. The purpose of this study was to determine how timing energy and carbohydrate replacement proximate to an exercise bout influences exercise-enhanced insulin action. To create an appropriate baseline, sensitivity to insulin was reduced in 9 healthy young men (n = 6) and women (n = 3) by 2 days of energy surplus and detraining. Then, insulin action (glucose uptake per unit plasma insulin) was assessed by stable isotope dilution during a continuous glucose infusion 12 h after a standardized meal under 4 conditions. In 3 conditions, the meal replaced the energy and carbohydrate expended during an exercise bout (62.9 ± 2.8 min cycle ergometry at 65% VO
2 peak
followed by ten 30 s sprints). The meal was given before (Pre), immediately after (ImmPost), or 3 h after exercise (Delay). The 4th condition was a no-exercise control (Control). Data were analyzed using linear mixed-effects models with planned contrasts. Relative to Control, insulin action increased by 22% in Pre (p = 0.05), 44% in ImmPost (p < 0.01), and 19% in Delay (p = 0.09). Non-oxidative disposal was higher, and oxidative disposal was lower in ImmPost relative to Control and Pre (p < 0.05). Hepatic glucose production was suppressed by the infusion to a greater extent in Pre and Delay (76.9% ± 8.8% and 81.2% ± 4.7%) compared with ImmPost (64.7% ± 10.0%). A bout of exercise enhances insulin action even when expended energy and carbohydrate are replaced. Further, timing of energy and carbohydrate consumption subtly modulates the effectiveness of exercise to enhance insulin action. |
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AbstractList | The nutritional environment surrounding an exercise bout modulates post-exercise insulin action. The purpose of this study was to determine how timing energy and carbohydrate replacement proximate to an exercise bout influences exercise-enhanced insulin action. To create an appropriate baseline, sensitivity to insulin was reduced in 9 healthy young men (n=6) and women (n=3) by 2 days of energy surplus and detraining. Then, insulin action (glucose uptake per unit plasma insulin) was assessed by stable isotope dilution during a continuous glucose infusion 12 h after a standardized meal under 4 conditions. In 3 conditions, the meal replaced the energy and carbohydrate expended during an exercise bout (62.9+/-2.8 min cycle ergometry at 65% VO2 peak followed by ten 30 s sprints). The meal was given before (Pre), immediately after (ImmPost), or 3 h after exercise (Delay). The 4th condition was a no-exercise control (Control). Data were analyzed using linear mixed-effects models with planned contrasts. Relative to Control, insulin action increased by 22% in Pre (p=0.05), 44% in ImmPost (p<0.01), and 19% in Delay (p=0.09). Non-oxidative disposal was higher, and oxidative disposal was lower in ImmPost relative to Control and Pre (p<0.05). Hepatic glucose production was suppressed by the infusion to a greater extent in Pre and Delay (76.9%+/-8.8% and 81.2%+/-4.7%) compared with ImmPost (64.7%+/-10.0%). A bout of exercise enhances insulin action even when expended energy and carbohydrate are replaced. Further, timing of energy and carbohydrate consumption subtly modulates the effectiveness of exercise to enhance insulin action. The nutritional environment surrounding an exercise bout modulates post-exercise insulin action. The purpose of this study was to determine how timing energy and carbohydrate replacement proximate to an exercise bout influences exercise-enhanced insulin action. To create an appropriate baseline, sensitivity to insulin was reduced in 9 healthy young men (n=6) and women (n=3) by 2 days of energy surplus and detraining. Then, insulin action (glucose uptake per unit plasma insulin) was assessed by stable isotope dilution during a continuous glucose infusion 12 h after a standardized meal under 4 conditions. In 3 conditions, the meal replaced the energy and carbohydrate expended during an exercise bout (62.9+/-2.8 min cycle ergometry at 65% VO2 peak followed by ten 30 s sprints). The meal was given before (Pre), immediately after (ImmPost), or 3 h after exercise (Delay). The 4th condition was a no-exercise control (Control). Data were analyzed using linear mixed-effects models with planned contrasts. Relative to Control, insulin action increased by 22% in Pre (p=0.05), 44% in ImmPost (p<0.01), and 19% in Delay (p=0.09). Non-oxidative disposal was higher, and oxidative disposal was lower in ImmPost relative to Control and Pre (p<0.05). Hepatic glucose production was suppressed by the infusion to a greater extent in Pre and Delay (76.9%+/-8.8% and 81.2%+/-4.7%) compared with ImmPost (64.7%+/-10.0%). A bout of exercise enhances insulin action even when expended energy and carbohydrate are replaced. Further, timing of energy and carbohydrate consumption subtly modulates the effectiveness of exercise to enhance insulin action. The nutritional environment surrounding an exercise bout modulates post-exercise insulin action. The purpose of this study was to determine how timing energy and carbohydrate replacement proximate to an exercise bout influences exercise-enhanced insulin action. To create an appropriate baseline, sensitivity to insulin was reduced in 9 healthy young men (n = 6) and women (n = 3) by 2 days of energy surplus and detraining. Then, insulin action (glucose uptake per unit plasma insulin) was assessed by stable isotope dilution during a continuous glucose infusion 12 h after a standardized meal under 4 conditions. In 3 conditions, the meal replaced the energy and carbohydrate expended during an exercise bout (62.9 ± 2.8 min cycle ergometry at 65% VO 2 peak followed by ten 30 s sprints). The meal was given before (Pre), immediately after (ImmPost), or 3 h after exercise (Delay). The 4th condition was a no-exercise control (Control). Data were analyzed using linear mixed-effects models with planned contrasts. Relative to Control, insulin action increased by 22% in Pre (p = 0.05), 44% in ImmPost (p < 0.01), and 19% in Delay (p = 0.09). Non-oxidative disposal was higher, and oxidative disposal was lower in ImmPost relative to Control and Pre (p < 0.05). Hepatic glucose production was suppressed by the infusion to a greater extent in Pre and Delay (76.9% ± 8.8% and 81.2% ± 4.7%) compared with ImmPost (64.7% ± 10.0%). A bout of exercise enhances insulin action even when expended energy and carbohydrate are replaced. Further, timing of energy and carbohydrate consumption subtly modulates the effectiveness of exercise to enhance insulin action. The nutritional environment surrounding an exercise bout modulates post-exercise insulin action. The purpose of this study was to determine how timing energy and carbohydrate replacement proximate to an exercise bout influences exercise-enhanced insulin action. To create an appropriate baseline, sensitivity to insulin was reduced in 9 healthy young men (n = 6) and women (n = 3) by 2 days of energy surplus and detraining. Then, insulin action (glucose uptake per unit plasma insulin) was assessed by stable isotope dilution during a continuous glucose infusion 12 h after a standardized meal under 4 conditions. In 3 conditions, the meal replaced the energy and carbohydrate expended during an exercise bout (62.9 c 2.8 min cycle ergometry at 65% VO sub(2 peak) followed by ten 30 s sprints). The meal was given before (Pre), immediately after (ImmPost), or 3 h after exercise (Delay). The 4th condition was a no-exercise control (Control). Data were analyzed using linear mixed-effects models with planned contrasts. Relative to Control, insulin action increased by 22% in Pre (p = 0.05), 44% in ImmPost (p < 0.01), and 19% in Delay (p = 0.09). Non-oxidative disposal was higher, and oxidative disposal was lower in ImmPost relative to Control and Pre (p < 0.05). Hepatic glucose production was suppressed by the infusion to a greater extent in Pre and Delay (76.9% c 8.8% and 81.2% c 4.7%) compared with ImmPost (64.7% c 10.0%). A bout of exercise enhances insulin action even when expended energy and carbohydrate are replaced. Further, timing of energy and carbohydrate consumption subtly modulates the effectiveness of exercise to enhance insulin action.Original Abstract: La consommation d'aliments dans les moments precedant ou suivant une seance d'activite physique conditionne l'action post-exercice de l'insuline. Le but de l'etude est d'evaluer l'effet du moment retenu pour remplacer l'energie des sucres depensee au cours d'une seance d'activite physique sur l'action de l'insuline deja facilitee par l'activite physique en soi. Pour etablir un niveau de base approprie, nous avons diminue la sensibilite a l'insuline chez 6 hommes et 3 femmes (tous jeunes et en sante) en leur procurant un surplus d'energie durant deux jours et en leur demandant une abstention d'activite physique. Par la suite, nous avons determine l'action de l'insuline (captation de glucose par unite plasmatique d'insuline) par la dilution d'un isotope stable durant une infusion continue de glucose 12 heures apres un repas standardise. Quatre conditions sont appliquees ; dans trois d'entre elles, le repas sert a remplacer l'energie des sucres depensee durant la seance d'activite physique (62,9 c 2,8 min de pedalage sur un ergocycle a une intensite correspondant a 65 % VO sub(2pointe) puis une serie de 10 sprints d'une duree de 30 s chacun) et il est servi avant la seance (Pre), immediatement apres (ImmPost) ou 3 h apres la fin de la seance (Delay). Dans la quatrieme condition, celle de controle, il n'y a pas de seance d'activite physique. Nous avons analyse les resultats au moyen de modeles lineaires aux effets mixes et incluant des contrastes planifies. Comparativement aux valeurs de la condition de controle, l'action de l'insuline augmente de 22 % dans Pre (p = 0,05), de 44 % dans ImmPost (p < 0,01) et de 19 % dans Delay (p = 0,09). Comparativement aux conditions de controle et Pre, on observe dans la condition ImmPost une plus grande elimination du glucose non oxyde et une plus faible elimination du glucose oxyde (p < 0,05). L'infusion de glucose suscite une plus grande diminution de la production hepatique de glucose dans les conditions Pre et Delay (76,9 c 8,8 % et 81,2 c 4,7 % respectivement) que dans la condition ImmPost (64,7 c 10,0 %). Une seance d'activite physique accroit l'action de l'insuline meme quand on redonne des sucres. De plus, le moment ou on procure l'energie des sucres modifie finement l'efficacite de l'action de l'insuline amelioree par la seance d'activite physique. The nutritional environment surrounding an exercise bout modulates post-exercise insulin action. The purpose of this study was to determine how timing energy and carbohydrate replacement proximate to an exercise bout influences exercise-enhanced insulin action. To create an appropriate baseline, sensitivity to insulin was reduced in 9 healthy young men (n = 6) and women (n = 3) by 2 days of energy surplus and detraining. Then, insulin action (glucose uptake per unit plasma insulin) was assessed by stable isotope dilution during a continuous glucose infusion 12 h after a standardized meal under 4 conditions. In 3 conditions, the meal replaced the energy and carbohydrate expended during an exercise bout (62.9 ± 2.8 min cycle ergometry at 65% VO 2 peak followed by ten 30 s sprints). The meal was given before (Pre), immediately after (ImmPost), or 3 h after exercise (Delay). The 4th condition was a no-exercise control (Control). Data were analyzed using linear mixed-effects models with planned contrasts. Relative to Control, insulin action increased by 22% in Pre (p = 0.05), 44% in ImmPost (p < 0.01), and 19% in Delay (p = 0.09). Non-oxidative disposal was higher, and oxidative disposal was lower in ImmPost relative to Control and Pre (p < 0.05). Hepatic glucose production was suppressed by the infusion to a greater extent in Pre and Delay (76.9% ± 8.8% and 81.2% ± 4.7%) compared with ImmPost (64.7% ± 10.0%). A bout of exercise enhances insulin action even when expended energy and carbohydrate are replaced. Further, timing of energy and carbohydrate consumption subtly modulates the effectiveness of exercise to enhance insulin action. |
Abstract_FL | La consommation d'aliments dans les moments précédant ou suivant une séance d'activité physique conditionne l'action post-exercice de l'insuline. Le but de l'étude est d'évaluer l'effet du moment retenu pour remplacer l'énergie des sucres dépensée au cours d'une séance d'activité physique sur l'action de l'insuline déjà facilitée par l'activité physique en soi. Pour établir un niveau de base approprié, nous avons diminué la sensibilité à l'insuline chez 6 hommes et 3 femmes (tous jeunes et en santé) en leur procurant un surplus d'énergie durant deux jours et en leur demandant une abstention d'activité physique. Par la suite, nous avons déterminé l'action de l'insuline (captation de glucose par unité plasmatique d'insuline) par la dilution d'un isotope stable durant une infusion continue de glucose 12 heures après un repas standardisé. Quatre conditions sont appliquées ;; dans trois d'entre elles, le repas sert à remplacer l'énergie des sucres dépensée durant la séance d'activité physique (62,9 ± 2,8 min de pédalage sur un ergocycle à une intensité correspondant à 65 % VO
2pointe
puis une série de 10 sprints d'une durée de 30 s chacun) et il est servi avant la séance (Pre), immédiatement après (ImmPost) ou 3 h après la fin de la séance (Delay). Dans la quatrième condition, celle de contrôle, il n'y a pas de séance d'activité physique. Nous avons analysé les résultats au moyen de modèles linéaires aux effets mixes et incluant des contrastes planifiés. Comparativement aux valeurs de la condition de contrôle, l'action de l'insuline augmente de 22 % dans Pre (p = 0,05), de 44 % dans ImmPost (p < 0,01) et de 19 % dans Delay (p = 0,09). Comparativement aux conditions de contrôle et Pre, on observe dans la condition ImmPost une plus grande élimination du glucose non oxydé et une plus faible élimination du glucose oxydé (p < 0,05). L'infusion de glucose suscite une plus grande diminution de la production hépatique de glucose dans les conditions Pre et Delay (76,9 ± 8,8 % et 81,2 ± 4,7 % respectivement) que dans la condition ImmPost (64,7 ± 10,0 %). Une séance d'activité physique accroît l'action de l'insuline même quand on redonne des sucres. De plus, le moment où on procure l'énergie des sucres modifie finement l'efficacité de l'action de l'insuline améliorée par la séance d'activité physique. |
Audience | Academic |
Author | Stephens, Brooke R Sautter, Jeffrey M Chipkin, Stuart R Braun, Barry Holtz, Kaila A Sharoff, Carrie G |
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SubjectTerms | Absorptiometry, Photon Adult Algorithms Anaerobic Threshold Bioenergetics Blood Glucose - metabolism Body Composition - physiology Carbohydrates Cross-Over Studies Dietary Carbohydrates - pharmacology drogue de l'effort Energy Intake - physiology Energy metabolism Energy Metabolism - drug effects Energy Metabolism - physiology Exercise Exercise - physiology exercise drug Female Glucose glucose disposal Glycerol - blood glycogen glycogène Humans Insulin Insulin - blood Insulin - physiology insulin sensitivity Kinetics Lipid Metabolism - drug effects Lipid Metabolism - physiology lipid oxidation Lipids Liver - drug effects Liver - metabolism Male Oxidation oxydation lipidique Physiological aspects sensibilité à l'insuline Time Factors élimination du glucose |
Title | Effect of timing of energy and carbohydrate replacement on post-exercise insulin action |
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